The Space Between

One possible interpretation is that it is a song about the Kingkiller Chronicles by Patrick Rothfuss, in particular about the Edema Ruh, a renowned folk of travelling actors and bards. They play an important role in the books since the main protagonist Kvothe is an Edema Ruh. The song being about the Kingkiller chronicles is only logical since "Auri" wrote other pieces concerning The Kingkiller Chronicles (The Name of The Wind, I hope your world is kind) and even called themselves after a side character, an ex-university student-girl Auri. The Edema Ruh have a strange custom regarding unknown travellers. Being travellers themselves, the Ruh live in wagons which are pulled through the country by horses, from city to city. When they choose to rest on the street, some single travellers can join them. They may want to warm themselves at their fire, share their food or find some shelter for the night.Instantly the Edema Ruh will offer them instantly a glass of wine. If the traveller is familiar with Edema Ruh (or even a real Edema Ruh from another group), he will refuse the wine and ask for a glass of water instead. Thus the Edema Ruh will know that he is to be trusted, and will offer to include him into their family, so he can continue his journey with them. If the traveller accepts the wine, the Ruh know that he is ignorant to the culture of the Ruh, and allow him to spend a night at their fire, but no more. So the song is possibly about a person who was invited to join the Edema Ruh, since he refused the wine. "In your scripted play On the stage you call home There's no seat set for an unknown guest" (The unknown guest being someone who would accept the wine) "Come with me" is the Invitation by the Edema Ruh. So in essence the person travels along and gets very immersed in the Edema Ruh culture; with their songwriting and music, is even encouraged to write on his own. "Front seat to history" - The Edema Ruh are said to "know all the stories of the world". If you travel along with them, having access to every script and play they ever preformed, or plan to perform, what better place to learn about (hi)story is there? Also the Ruh are known to stay very true to the original story, and hate mixing it up. Kvothe's parents have travelled for years and interwieved peasants and visitors of their plays, to collect information about the about historical events and the associated myths, to be satisfyingly able to turn it into a play. Thus "The sons and daughters of endlessness" are heroic people, who'll be remembered and honoured forever, the Edema Ruh contributing to this by spreading their stories. "Why the mean mouth (...) Those songs to end all hearing" can refer to different things. It is important to know that the Edema Ruh are severly discriminated against, being seen as thiefs and uneducated, demoralized folk, and hate crimes are common. In fact none of those prejudices are true, and the Ruh have rigid moral rules, which they do not dare to break. This unjustified discrimination is certainly a parallel to modern gypsie/Sinti&Roma prejudices. Nontheless, the people enjoy the plays of the Edema Ruh, but still do not want to be associated with - such hypocrites; a lord once even forbade Kvothe's group to enter his city, being scared to be seen a supportive of Edema Ruh, and assigned them to hold their plays in front of the city gates. So the "mean mouth" is to be understood as hate speech against the Edema Ruh, a hateful song, to end listening to the Edema Ruh plays, which the haters normally would enjoy. On the other hand it might refer to (spoiler) the Tale of the Chandrian, which Kvothe's parents researched on and wrote into a musical. The Chandrian are old, very powerful and evil entities, which meticulously erase all knowledge about their existence from human memory, usually by killing anyone who knows too much. Before being able to pesent the first performance of said tale... the Chandrian slaughtered everyone from Kvothe's Edema Ruh group, Kvothe being the only survivor. Kvothe's parents basically sang "songs to end all hearing". "I'll take you to the rings" is the most cryptic sentence. Rings have a crucial meaning at the court of the Maershon, where different nobles lend each other rings made of different materials, to show their respect of each other. Another place where rings are used is in Naming classes at the unversity, where a person, as soon they mastered the name of a thing/element, creates a ring with their new power. However I do not see any connection with the Edema Ruh, unless it is about stories which concern great Namers (aka magicians).